Double backpack



FIG. 1 is a front perspective view of our new design for a double backpack;

FIG. 2 is a front plan view of our new design for a double backpack;

FIG. 3 is a left side plan view of our new design for a double backpack;

FIG. 4 is a back plan view of our new design for a double backpack;

FIG. 5 is a right side plan view of our new design for a double backpack;

FIG. 6 is a top plan view of our new design for a double backpack; and,

FIG. 7 is a bottom plan view of our new design for a double backpack.

The evenly dashed lines in the drawings depict stitching and form no part of the claim. 

CLAIM The ornamental design for a double backpack, as shown and described. 